linux-kernel - Re: [tip:timers/core] timekeeping: Increase granularity of read_persistent

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Message-ID: <20090822222313.74b9619c@skybase>
Date:	Sat, 22 Aug 2009 22:23:13 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	dwalker@...o99.com, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, johnstul@...ibm.com,
	tglx@...utronix.de, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:timers/core] timekeeping: Increase granularity of
 read_persistent_clock()

On Sat, 22 Aug 2009 17:33:46 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Martin Schwidefsky <schwidefsky@...ibm.com> wrote:
> 
> > > FYI, -tip arch-testing found that this commit broke the PowerPC 
> > > build:
> > > 
> > > /home/mingo/tip/arch/powerpc/kernel/time.c: In function 'read_persistent_clock':
> > > /home/mingo/tip/arch/powerpc/kernel/time.c:788: error: 'return' with a value, in function returning void
> > > /home/mingo/tip/arch/powerpc/kernel/time.c:791: error: 'return' with a value, in function returning void
> > > make[2]: *** [arch/powerpc/kernel/time.o] Error 1
> > > make[2]: *** Waiting for unfinished jobs....
> > > make[1]: *** [arch/powerpc/kernel] Error 2
> > 
> > I overlooked a case in the powerpc version of read_persistent_lock.
> > New patch:
> 
> the patches are already committed and this patch doesnt apply - mind 
> sending a delta fix against tip:master:
> 
>  http://people.redhat.com/mingo/tip.git/README

Here we go:

--
Subject: [PATCH] powerpc: build fix for read_persistent_clock

From: Martin Schwidefsky <schwidefsky@...ibm.com>

Fix the following build problem on powerpc:

arch/powerpc/kernel/time.c: In function 'read_persistent_clock':
arch/powerpc/kernel/time.c:788: error: 'return' with a value, in function returning void
arch/powerpc/kernel/time.c:791: error: 'return' with a value, in function returning void
make[2]: *** [arch/powerpc/kernel/time.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [arch/powerpc/kernel] Error 2  

Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
---
 arch/powerpc/kernel/time.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

Index: linux-2.6/arch/powerpc/kernel/time.c
===================================================================
--- linux-2.6.orig/arch/powerpc/kernel/time.c
+++ linux-2.6/arch/powerpc/kernel/time.c
@@ -774,6 +774,7 @@ void read_persistent_clock(struct timesp
 	struct rtc_time tm;
 	static int first = 1;
 
+	ts->tv_nsec = 0;
 	/* XXX this is a litle fragile but will work okay in the short term */
 	if (first) {
 		first = 0;
@@ -781,15 +782,18 @@ void read_persistent_clock(struct timesp
 			timezone_offset = ppc_md.time_init();
 
 		/* get_boot_time() isn't guaranteed to be safe to call late */
-		if (ppc_md.get_boot_time)
-			return ppc_md.get_boot_time() -timezone_offset;
+		if (ppc_md.get_boot_time) {
+			ts->tv_sec = ppc_md.get_boot_time() -timezone_offset;
+			return;
+		}
+	}
+	if (!ppc_md.get_rtc_time) {
+		ts->tv_sec = 0;
+		return;
 	}
-	if (!ppc_md.get_rtc_time)
-		return 0;
 	ppc_md.get_rtc_time(&tm);
 	ts->tv_sec = mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
 			    tm.tm_hour, tm.tm_min, tm.tm_sec);
-	ts->tv_nsec = 0;
 }
 
 /* clocksource code */

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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